import java.util.Scanner;
public class Zuoye10 {
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        System.out.print("请输入天数：");
        int a=in.nextInt();
        if(a%5<=3&&a%5>0)
            System.out.println("打鱼。");
        else
            System.out.println("筛网。");
    }
}
